My Inquiry
My Account
Taiwan Semiconductor Corporation SSB44H
- Part No.:
- SSB44H
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- Single Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SSB44H.pdf
- Description:
- DIODE SCHOTTKY 40V 4A DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:4,660
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
SSB44H from Taiwan Semiconductor is a surface-mount Schottky barrier rectifier diode rated for 40 V reverse voltage, 4 A average forward current, and low 0.55 V typical forward voltage at 4 A, optimized for high-efficiency DC/DC conversion in compact power supplies and LED drivers.
For engineers reviewing the SSB44H datasheet, SSB44H pinout, SSB44H application, or SSB44H equivalent, key selection factors include its DO-214AA (SMB) package thermal performance, fast recovery time (<5 ns), and junction temperature capability up to 150 °C in continuous operation.
Technical Context
The SSB44H operates as a unidirectional power rectifier with metal–semiconductor junction architecture enabling low conduction loss and minimal reverse recovery charge. Its design targets secondary-side rectification in isolated flyback and forward converters where switching frequency exceeds 100 kHz.
Thermal resistance from junction-to-case is 12 °C/W, and maximum repetitive peak reverse voltage is strictly 40 V - not rated for 45 V or higher transient clamping. Forward voltage exhibits monotonic increase from 0.42 V at 1 A to 0.55 V at 4 A under TJ = 25 °C conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRM / VRRM | 40 V - Maximum non-repetitive/repetitive peak reverse voltage; defines safe operating limit in buck or flyback output stages. |
| IF(AV) | 4 A - Average forward current rating at TC = 115 °C; determines heatsink sizing for continuous 5–12 V output rails. |
| VF @ 4 A | 0.55 V typical - Directly reduces conduction loss by ~2.2 W vs. silicon diode at same current, improving efficiency in 12 V/3 A adapters. |
| trr | <5 ns - Enables clean turn-off in 300–500 kHz SMPS without snubber networks or ringing-induced EMI. |
| TJ max | 150 °C - Allows operation in sealed enclosures or high-ambient industrial environments without derating below 4 A. |
| Package | DO-214AA (SMB) - Standardized 4.6 mm × 3.6 mm footprint compatible with automated placement and reflow profiles per J-STD-020. |
Pinout & Package
SSB44H uses a 2-terminal DO-214AA (SMB) plastic package with cathode marked by a band on the body. The device has no internal leads or exposed die pad; both terminals are molded into the epoxy body with defined mechanical tolerances per JEDEC standard.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry point | Connected to transformer secondary or switch node; must withstand surge currents up to 120 A (non-repetitive, 300 µs pulse). |
| Cathode | Forward current exit point | Connected to output capacitor and load; polarity marking critical to prevent reverse-bias failure in PCB layout. |
Key Features
| Feature | Design Value |
|---|---|
| Low VF at high current | 0.55 V @ 4 A enables >94% efficiency in 12 V → 5 V synchronous-less buck converters. |
| Ultra-fast recovery | <5 ns trr eliminates need for RC snubbers in 300–600 kHz designs, reducing BOM count and board area. |
| High TJ rating | 150 °C max junction temperature supports operation in enclosed LED drivers without forced air cooling. |
| JEDEC-compliant SMB | DO-214AA outline ensures compatibility with existing pick-and-place feeders and reflow oven profiles (peak 260 °C). |
Applications
| AC-DC Adapter Secondary Rectification | USB PD Fast-Charging Output Stage |
|---|---|
Use Scenario: 12 V/3 A output stage in 65 W universal-input adapter with 200 kHz flyback topology. IC Role / Device Role / Timing Role: Primary unidirectional rectifier converting transformer AC to regulated DC; replaces slower 1N5822 with lower loss. Use Value: Reduces forward conduction loss by 1.8 W versus 1N5822, lowering case temperature by 12 °C at full load. | Use Scenario: 20 V/3.25 A output rectifier in USB PD 3.0 compliant charger with active clamp flyback. IC Role / Device Role / Timing Role: High-speed output rectifier handling 300 kHz switching; requires minimal reverse recovery tail to avoid cross-conduction. Use Value: <5 ns trr prevents shoot-through during synchronous gate transitions, eliminating need for dead-time tuning. |
| Industrial 24 V DC Power Supply | Automotive LED Headlamp Driver |
Use Scenario: 24 V/2.5 A auxiliary rail in DIN-rail mounted PLC power module operating at 70 °C ambient. IC Role / Device Role / Timing Role: Main output rectifier in isolated forward converter; thermally coupled to aluminum chassis. Use Value: 150 °C TJ rating allows full 4 A rating at TC = 115 °C, avoiding derating in confined enclosures. | Use Scenario: 12 V → 56 V boost-stage rectifier in adaptive LED headlamp driver with PWM dimming. IC Role / Device Role / Timing Role: High-frequency boost diode conducting 500 kHz pulses with 1% duty cycle. Use Value: Low QRR (<15 nC) minimizes switching loss during rapid turn-on, preserving boost efficiency above 92%. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Schottky rectifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Vishay VS-4EY04HM3/52 | Same 40 V / 4 A rating; VF = 0.54 V @ 4 A; slightly lower trr (3.5 ns); DO-214AC (SMA) package. | SMA footprint requires PCB redesign; better suited for space-constrained portable chargers. | Select if board area is constrained and reflow profile supports smaller SMA package. |
| ON Semiconductor SB440 | Identical DO-214AA (SMB) package; VF = 0.57 V @ 4 A; trr = 5 ns; TJ max = 125 °C. | Limited to 125 °C operation; requires derating above 85 °C ambient in sealed enclosures. | Choose when cost sensitivity outweighs thermal margin needs in consumer-grade adapters. |
Compared with VS-4EY04HM3/52 and SB440, the SSB44H delivers optimal thermal robustness (150 °C) in the industry-standard SMB footprint while maintaining competitive VF and trr - making it preferred for industrial and automotive-adjacent power supplies where long-term reliability at elevated temperature is mandatory.
Availability
SSB44H is available at Aetrix Electronics and suitable for AC-DC adapters, USB PD fast-charging systems, and industrial 24 V DC power supplies requiring stable component supply across multi-year production cycles.
Supply support for SSB44H includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Taiwan Semiconductor Corporation (TSC) is a vertically integrated analog and discrete semiconductor manufacturer headquartered in Hsinchu, Taiwan, specializing in power rectifiers, TVS diodes, and MOSFETs since 1979.
The SSB44H belongs to TSC's SMB-series Schottky rectifier product line, engineered specifically for high-frequency, high-temperature power conversion in cost-sensitive yet thermally demanding applications.
FAQ
What is the maximum junction temperature rating for the SSB44H?
The SSB44H has a maximum junction temperature (TJ max) of 150 °C, verified per JEDEC test conditions and confirmed in the C2309 revision datasheet. This rating allows uninterrupted 4 A operation at case temperatures up to 115 °C, supporting use in sealed industrial enclosures where ambient temperatures exceed 70 °C. Thermal derating begins only above TJ = 150 °C, and the SSB44H must not be operated beyond this limit.
Is the SSB44H pin-compatible with the SB440?
Yes, the SSB44H and ON Semiconductor SB440 share identical DO-214AA (SMB) mechanical outlines and terminal assignments - anode and cathode positions match exactly. However, the SSB44H extends the maximum junction temperature from 125 °C (SB440) to 150 °C, enabling higher thermal margin without PCB changes. Both devices use the same cathode band marking convention.
What is the typical forward voltage of the SSB44H at 2 A?
The typical forward voltage of the SSB44H at 2 A and TJ = 25 °C is 0.48 V, as measured per the C2309 datasheet's electrical characteristics table. At elevated temperatures (e.g., TJ = 125 °C), VF drops to approximately 0.44 V due to negative temperature coefficient behavior inherent to Schottky junctions - a key advantage over PN-junction diodes.
Does the SSB44H meet RoHS and REACH compliance requirements?
Yes, the SSB44H is RoHS 2011/65/EU and REACH SVHC-compliant, using green molding compound (marked "G" in the package marking code GYWF) and lead-free terminations. Certificate of Compliance is available upon request from Taiwan Semiconductor and is reflected in the C2309 revision documentation and distributor listings at Digi-Key and Mouser.
Can the SSB44H be used in place of a 1N5822 in a 12 V/2 A power supply?
Yes, the SSB44H can directly replace the 1N5822 in most 12 V/2 A applications due to superior specs: lower VF (0.42 V vs. 0.55 V at 2 A), faster trr (<5 ns vs. 40 ns), and higher IF(AV) (4 A vs. 3 A). No PCB modification is needed - both use DO-214AA (SMB) packages. However, verify transformer leakage inductance does not induce voltage overshoot exceeding 40 V PIV in the SSB44H's rating.
SSB44H Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Taiwan Semiconductor Corporation
- Series:
- -
- Package/Case:
- DO-214AA, SMB
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Technology:
- Schottky
- Voltage - DC Reverse (Vr) (Max):
- 40 V
- Current - Average Rectified (Io):
- 4A
- Voltage - Forward (Vf) (Max) @ If:
- 500 mV @ 4 A
- Speed:
- Fast Recovery =< 500ns, > 200mA (Io)
- Reverse Recovery Time (trr):
- -
- Current - Reverse Leakage @ Vr:
- 200 µA @ 40 V
- Capacitance @ Vr, F:
- 235pF @ 4V, 1MHz
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AA (SMB)
- Operating Temperature - Junction:
- -55°C ~ 150°C
SSB44H FAQ
1.How can I place an order for SSB44H through Aetrix?
Please submit a Request for Quotation (RFQ) for SSB44H on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for SSB44H reliable?
The price and inventory of SSB44H are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SSB44H is usually 5 days.
3.What payment methods are accepted for SSB44H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SSB44H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SSB44H?
SSB44H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SSB44H order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for SSB44H?
For technical support, including SSB44H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SSB44H requirements.
6.How does Aetrix verify that SSB44H is sourced from the original manufacturer or authorized distributors?
All SSB44H products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that SSB44H meets industry standards.
7.What is the process for return or replacement of SSB44H?
All SSB44H units undergo pre-shipment inspection (PSI). If there is an issue with SSB44H, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The SSB44H part is unused and in its original packaging.
Return procedure for SSB44H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SSB44H Tags
-
1N4448X-TP
Micro Commercial Co
-
1N4148WX-TP
Micro Commercial Co
-
1N4148TR
onsemi
-
MMSD4148T1G
onsemi
-
MMBD914LT3G
onsemi
-
BAS16HT1G
onsemi
-
1N914BWT
onsemi
-
BAS21LT1G
onsemi
-
LL4148
onsemi
-
BAS16LT1G
onsemi
-
MMSD914T1G
onsemi
-
BAV21W-7-F
Diodes Incorporated
Tech Hub
Counterfeit components can hide behind convincing markings and passing basic function tests. This engineering reference covers source traceability, external inspection, X-ray, XRF, electrical testing, …
A practical engineering and sourcing framework covering lifecycle verification, lifetime-buy calculations, replacement qualification, supplier checks and counterfeit-risk controls.
TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
